Displayed Errors - A.O. Smith DRE PLUS Installation, User And Service Manual

Indication
Insufficient or no hot
water
EN
Earth leakage circuit
breaker is out
A safety device is acti-
vated
11.1.2
n
68
Cause
The water heater is off.
The temperature is set too low.
There is no supply voltage.
The hot water supply is used up.
A safety device is activated.
There is not enough water in the tank.
One of the heating elements is defec-
tive.
The main safety thermostat (G1) is acti-
vated
The row safety thermostat (G2) is acti-
vated.

Displayed errors

Note
For the coding of the connections, refer to the Electrical wiring diagram (see A.5).
Measure
Turn on the water heater (see 4.1).
Set the setpoint higher.
Make sure that:
- the isolator is in ON position.
- there is power on the isolator.
- there is power to the electrical connec-
tor block.
The measured voltage must be
400 V (-15%, +10%).
AC
Reduce the hot water consumption. Wait un-
til the water heater heats up.
- Make sure that the voltage between
the connections of the heating ele-
ments is 230VAC (-15%, +10%).
- Refer to indication "A safety device is
activated", next page.
- Make sure that the water heater is fil-
led with water.
- Measure the resistance value between
each heating element connection and
the outside of the tank. The value
must be infinite.
- Determine which element is defective.
- Make sure the water heater is com-
pletely filled.
- Tap off water, so the temperature
drops in the water heater.
- Make sure all connections are connec-
ted correctly (refer to the wiring dia-
gram).
- Use the white button to manually reset
the thermostat.
- If necessary, replace the safety ther-
mostat (G1).
- Tap off water, so the temperature
drops in the water heater.
- Make sure all connections are connec-
ted properly (refer to the wiring dia-
gram).
- Use the red button to manually reset
the thermostat.
- If necessary, replace the safety ther-
mostat (G2).
Installation, Maintenance and Service part